1/* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved. 4 * 5 * This copyrighted material is made available to anyone wishing to use, 6 * modify, copy, or redistribute it subject to the terms and conditions 7 * of the GNU General Public License version 2. 8 */ 9 10/* 11 * Quota change tags are associated with each transaction that allocates or 12 * deallocates space. Those changes are accumulated locally to each node (in a 13 * per-node file) and then are periodically synced to the quota file. This 14 * avoids the bottleneck of constantly touching the quota file, but introduces 15 * fuzziness in the current usage value of IDs that are being used on different 16 * nodes in the cluster simultaneously. So, it is possible for a user on 17 * multiple nodes to overrun their quota, but that overrun is controlable. 18 * Since quota tags are part of transactions, there is no need for a quota check 19 * program to be run on node crashes or anything like that. 20 * 21 * There are couple of knobs that let the administrator manage the quota 22 * fuzziness. "quota_quantum" sets the maximum time a quota change can be 23 * sitting on one node before being synced to the quota file. (The default is 24 * 60 seconds.) Another knob, "quota_scale" controls how quickly the frequency 25 * of quota file syncs increases as the user moves closer to their limit. The 26 * more frequent the syncs, the more accurate the quota enforcement, but that 27 * means that there is more contention between the nodes for the quota file. 28 * The default value is one. This sets the maximum theoretical quota overrun 29 * (with infinite node with infinite bandwidth) to twice the user's limit. (In 30 * practice, the maximum overrun you see should be much less.) A "quota_scale" 31 * number greater than one makes quota syncs more frequent and reduces the 32 * maximum overrun. Numbers less than one (but greater than zero) make quota 33 * syncs less frequent. 34 * 35 * GFS quotas also use per-ID Lock Value Blocks (LVBs) to cache the contents of 36 * the quota file, so it is not being constantly read. 37 */ 38 39#include <linux/sched.h> 40#include <linux/slab.h> 41#include <linux/spinlock.h> 42#include <linux/completion.h> 43#include <linux/buffer_head.h> 44#include <linux/sort.h> 45#include <linux/fs.h> 46#include <linux/bio.h> 47#include <linux/gfs2_ondisk.h> 48#include <linux/kthread.h> 49#include <linux/freezer.h> 50#include <linux/quota.h> 51#include <linux/dqblk_xfs.h> 52 53#include "gfs2.h" 54#include "incore.h" 55#include "bmap.h" 56#include "glock.h" 57#include "glops.h" 58#include "log.h" 59#include "meta_io.h" 60#include "quota.h" 61#include "rgrp.h" 62#include "super.h" 63#include "trans.h" 64#include "inode.h" 65#include "util.h" 66 67#define QUOTA_USER 1 68#define QUOTA_GROUP 0 69 70struct gfs2_quota_change_host { 71 u64 qc_change; 72 u32 qc_flags; /* GFS2_QCF_... */ 73 u32 qc_id; 74}; 75 76static LIST_HEAD(qd_lru_list); 77static atomic_t qd_lru_count = ATOMIC_INIT(0); 78static DEFINE_SPINLOCK(qd_lru_lock); 79 80int gfs2_shrink_qd_memory(struct shrinker *shrink, int nr, gfp_t gfp_mask) 81{ 82 struct gfs2_quota_data *qd; 83 struct gfs2_sbd *sdp; 84 85 if (nr == 0) 86 goto out; 87 88 if (!(gfp_mask & __GFP_FS)) 89 return -1; 90 91 spin_lock(&qd_lru_lock); 92 while (nr && !list_empty(&qd_lru_list)) { 93 qd = list_entry(qd_lru_list.next, 94 struct gfs2_quota_data, qd_reclaim); 95 sdp = qd->qd_gl->gl_sbd; 96 97 /* Free from the filesystem-specific list */ 98 list_del(&qd->qd_list); 99 100 gfs2_assert_warn(sdp, !qd->qd_change); 101 gfs2_assert_warn(sdp, !qd->qd_slot_count); 102 gfs2_assert_warn(sdp, !qd->qd_bh_count); 103 104 gfs2_glock_put(qd->qd_gl); 105 atomic_dec(&sdp->sd_quota_count); 106 107 /* Delete it from the common reclaim list */ 108 list_del_init(&qd->qd_reclaim); 109 atomic_dec(&qd_lru_count); 110 spin_unlock(&qd_lru_lock); 111 kmem_cache_free(gfs2_quotad_cachep, qd); 112 spin_lock(&qd_lru_lock); 113 nr--; 114 } 115 spin_unlock(&qd_lru_lock); 116 117out: 118 return (atomic_read(&qd_lru_count) * sysctl_vfs_cache_pressure) / 100; 119} 120 121static u64 qd2offset(struct gfs2_quota_data *qd) 122{ 123 u64 offset; 124 125 offset = 2 * (u64)qd->qd_id + !test_bit(QDF_USER, &qd->qd_flags); 126 offset *= sizeof(struct gfs2_quota); 127 128 return offset; 129} 130 131static int qd_alloc(struct gfs2_sbd *sdp, int user, u32 id, 132 struct gfs2_quota_data **qdp) 133{ 134 struct gfs2_quota_data *qd; 135 int error; 136 137 qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS); 138 if (!qd) 139 return -ENOMEM; 140 141 atomic_set(&qd->qd_count, 1); 142 qd->qd_id = id; 143 if (user) 144 set_bit(QDF_USER, &qd->qd_flags); 145 qd->qd_slot = -1; 146 INIT_LIST_HEAD(&qd->qd_reclaim); 147 148 error = gfs2_glock_get(sdp, 2 * (u64)id + !user, 149 &gfs2_quota_glops, CREATE, &qd->qd_gl); 150 if (error) 151 goto fail; 152 153 *qdp = qd; 154 155 return 0; 156 157fail: 158 kmem_cache_free(gfs2_quotad_cachep, qd); 159 return error; 160} 161 162static int qd_get(struct gfs2_sbd *sdp, int user, u32 id, 163 struct gfs2_quota_data **qdp) 164{ 165 struct gfs2_quota_data *qd = NULL, *new_qd = NULL; 166 int error, found; 167 168 *qdp = NULL; 169 170 for (;;) { 171 found = 0; 172 spin_lock(&qd_lru_lock); 173 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) { 174 if (qd->qd_id == id && 175 !test_bit(QDF_USER, &qd->qd_flags) == !user) { 176 if (!atomic_read(&qd->qd_count) && 177 !list_empty(&qd->qd_reclaim)) { 178 /* Remove it from reclaim list */ 179 list_del_init(&qd->qd_reclaim); 180 atomic_dec(&qd_lru_count); 181 } 182 atomic_inc(&qd->qd_count); 183 found = 1; 184 break; 185 } 186 } 187 188 if (!found) 189 qd = NULL; 190 191 if (!qd && new_qd) { 192 qd = new_qd; 193 list_add(&qd->qd_list, &sdp->sd_quota_list); 194 atomic_inc(&sdp->sd_quota_count); 195 new_qd = NULL; 196 } 197 198 spin_unlock(&qd_lru_lock); 199 200 if (qd) { 201 if (new_qd) { 202 gfs2_glock_put(new_qd->qd_gl); 203 kmem_cache_free(gfs2_quotad_cachep, new_qd); 204 } 205 *qdp = qd; 206 return 0; 207 } 208 209 error = qd_alloc(sdp, user, id, &new_qd); 210 if (error) 211 return error; 212 } 213} 214 215static void qd_hold(struct gfs2_quota_data *qd) 216{ 217 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 218 gfs2_assert(sdp, atomic_read(&qd->qd_count)); 219 atomic_inc(&qd->qd_count); 220} 221 222static void qd_put(struct gfs2_quota_data *qd) 223{ 224 if (atomic_dec_and_lock(&qd->qd_count, &qd_lru_lock)) { 225 /* Add to the reclaim list */ 226 list_add_tail(&qd->qd_reclaim, &qd_lru_list); 227 atomic_inc(&qd_lru_count); 228 spin_unlock(&qd_lru_lock); 229 } 230} 231 232static int slot_get(struct gfs2_quota_data *qd) 233{ 234 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 235 unsigned int c, o = 0, b; 236 unsigned char byte = 0; 237 238 spin_lock(&qd_lru_lock); 239 240 if (qd->qd_slot_count++) { 241 spin_unlock(&qd_lru_lock); 242 return 0; 243 } 244 245 for (c = 0; c < sdp->sd_quota_chunks; c++) 246 for (o = 0; o < PAGE_SIZE; o++) { 247 byte = sdp->sd_quota_bitmap[c][o]; 248 if (byte != 0xFF) 249 goto found; 250 } 251 252 goto fail; 253 254found: 255 for (b = 0; b < 8; b++) 256 if (!(byte & (1 << b))) 257 break; 258 qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b; 259 260 if (qd->qd_slot >= sdp->sd_quota_slots) 261 goto fail; 262 263 sdp->sd_quota_bitmap[c][o] |= 1 << b; 264 265 spin_unlock(&qd_lru_lock); 266 267 return 0; 268 269fail: 270 qd->qd_slot_count--; 271 spin_unlock(&qd_lru_lock); 272 return -ENOSPC; 273} 274 275static void slot_hold(struct gfs2_quota_data *qd) 276{ 277 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 278 279 spin_lock(&qd_lru_lock); 280 gfs2_assert(sdp, qd->qd_slot_count); 281 qd->qd_slot_count++; 282 spin_unlock(&qd_lru_lock); 283} 284 285static void slot_put(struct gfs2_quota_data *qd) 286{ 287 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 288 289 spin_lock(&qd_lru_lock); 290 gfs2_assert(sdp, qd->qd_slot_count); 291 if (!--qd->qd_slot_count) { 292 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0); 293 qd->qd_slot = -1; 294 } 295 spin_unlock(&qd_lru_lock); 296} 297 298static int bh_get(struct gfs2_quota_data *qd) 299{ 300 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 301 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); 302 unsigned int block, offset; 303 struct buffer_head *bh; 304 int error; 305 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 }; 306 307 mutex_lock(&sdp->sd_quota_mutex); 308 309 if (qd->qd_bh_count++) { 310 mutex_unlock(&sdp->sd_quota_mutex); 311 return 0; 312 } 313 314 block = qd->qd_slot / sdp->sd_qc_per_block; 315 offset = qd->qd_slot % sdp->sd_qc_per_block; 316 317 bh_map.b_size = 1 << ip->i_inode.i_blkbits; 318 error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0); 319 if (error) 320 goto fail; 321 error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh); 322 if (error) 323 goto fail; 324 error = -EIO; 325 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) 326 goto fail_brelse; 327 328 qd->qd_bh = bh; 329 qd->qd_bh_qc = (struct gfs2_quota_change *) 330 (bh->b_data + sizeof(struct gfs2_meta_header) + 331 offset * sizeof(struct gfs2_quota_change)); 332 333 mutex_unlock(&sdp->sd_quota_mutex); 334 335 return 0; 336 337fail_brelse: 338 brelse(bh); 339fail: 340 qd->qd_bh_count--; 341 mutex_unlock(&sdp->sd_quota_mutex); 342 return error; 343} 344 345static void bh_put(struct gfs2_quota_data *qd) 346{ 347 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 348 349 mutex_lock(&sdp->sd_quota_mutex); 350 gfs2_assert(sdp, qd->qd_bh_count); 351 if (!--qd->qd_bh_count) { 352 brelse(qd->qd_bh); 353 qd->qd_bh = NULL; 354 qd->qd_bh_qc = NULL; 355 } 356 mutex_unlock(&sdp->sd_quota_mutex); 357} 358 359static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp) 360{ 361 struct gfs2_quota_data *qd = NULL; 362 int error; 363 int found = 0; 364 365 *qdp = NULL; 366 367 if (sdp->sd_vfs->s_flags & MS_RDONLY) 368 return 0; 369 370 spin_lock(&qd_lru_lock); 371 372 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) { 373 if (test_bit(QDF_LOCKED, &qd->qd_flags) || 374 !test_bit(QDF_CHANGE, &qd->qd_flags) || 375 qd->qd_sync_gen >= sdp->sd_quota_sync_gen) 376 continue; 377 378 list_move_tail(&qd->qd_list, &sdp->sd_quota_list); 379 380 set_bit(QDF_LOCKED, &qd->qd_flags); 381 gfs2_assert_warn(sdp, atomic_read(&qd->qd_count)); 382 atomic_inc(&qd->qd_count); 383 qd->qd_change_sync = qd->qd_change; 384 gfs2_assert_warn(sdp, qd->qd_slot_count); 385 qd->qd_slot_count++; 386 found = 1; 387 388 break; 389 } 390 391 if (!found) 392 qd = NULL; 393 394 spin_unlock(&qd_lru_lock); 395 396 if (qd) { 397 gfs2_assert_warn(sdp, qd->qd_change_sync); 398 error = bh_get(qd); 399 if (error) { 400 clear_bit(QDF_LOCKED, &qd->qd_flags); 401 slot_put(qd); 402 qd_put(qd); 403 return error; 404 } 405 } 406 407 *qdp = qd; 408 409 return 0; 410} 411 412static int qd_trylock(struct gfs2_quota_data *qd) 413{ 414 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 415 416 if (sdp->sd_vfs->s_flags & MS_RDONLY) 417 return 0; 418 419 spin_lock(&qd_lru_lock); 420 421 if (test_bit(QDF_LOCKED, &qd->qd_flags) || 422 !test_bit(QDF_CHANGE, &qd->qd_flags)) { 423 spin_unlock(&qd_lru_lock); 424 return 0; 425 } 426 427 list_move_tail(&qd->qd_list, &sdp->sd_quota_list); 428 429 set_bit(QDF_LOCKED, &qd->qd_flags); 430 gfs2_assert_warn(sdp, atomic_read(&qd->qd_count)); 431 atomic_inc(&qd->qd_count); 432 qd->qd_change_sync = qd->qd_change; 433 gfs2_assert_warn(sdp, qd->qd_slot_count); 434 qd->qd_slot_count++; 435 436 spin_unlock(&qd_lru_lock); 437 438 gfs2_assert_warn(sdp, qd->qd_change_sync); 439 if (bh_get(qd)) { 440 clear_bit(QDF_LOCKED, &qd->qd_flags); 441 slot_put(qd); 442 qd_put(qd); 443 return 0; 444 } 445 446 return 1; 447} 448 449static void qd_unlock(struct gfs2_quota_data *qd) 450{ 451 gfs2_assert_warn(qd->qd_gl->gl_sbd, 452 test_bit(QDF_LOCKED, &qd->qd_flags)); 453 clear_bit(QDF_LOCKED, &qd->qd_flags); 454 bh_put(qd); 455 slot_put(qd); 456 qd_put(qd); 457} 458 459static int qdsb_get(struct gfs2_sbd *sdp, int user, u32 id, 460 struct gfs2_quota_data **qdp) 461{ 462 int error; 463 464 error = qd_get(sdp, user, id, qdp); 465 if (error) 466 return error; 467 468 error = slot_get(*qdp); 469 if (error) 470 goto fail; 471 472 error = bh_get(*qdp); 473 if (error) 474 goto fail_slot; 475 476 return 0; 477 478fail_slot: 479 slot_put(*qdp); 480fail: 481 qd_put(*qdp); 482 return error; 483} 484 485static void qdsb_put(struct gfs2_quota_data *qd) 486{ 487 bh_put(qd); 488 slot_put(qd); 489 qd_put(qd); 490} 491 492int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid) 493{ 494 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 495 struct gfs2_alloc *al = ip->i_alloc; 496 struct gfs2_quota_data **qd = al->al_qd; 497 int error; 498 499 if (gfs2_assert_warn(sdp, !al->al_qd_num) || 500 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags))) 501 return -EIO; 502 503 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 504 return 0; 505 506 error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, qd); 507 if (error) 508 goto out; 509 al->al_qd_num++; 510 qd++; 511 512 error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, qd); 513 if (error) 514 goto out; 515 al->al_qd_num++; 516 qd++; 517 518 if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) { 519 error = qdsb_get(sdp, QUOTA_USER, uid, qd); 520 if (error) 521 goto out; 522 al->al_qd_num++; 523 qd++; 524 } 525 526 if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) { 527 error = qdsb_get(sdp, QUOTA_GROUP, gid, qd); 528 if (error) 529 goto out; 530 al->al_qd_num++; 531 qd++; 532 } 533 534out: 535 if (error) 536 gfs2_quota_unhold(ip); 537 return error; 538} 539 540void gfs2_quota_unhold(struct gfs2_inode *ip) 541{ 542 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 543 struct gfs2_alloc *al = ip->i_alloc; 544 unsigned int x; 545 546 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)); 547 548 for (x = 0; x < al->al_qd_num; x++) { 549 qdsb_put(al->al_qd[x]); 550 al->al_qd[x] = NULL; 551 } 552 al->al_qd_num = 0; 553} 554 555static int sort_qd(const void *a, const void *b) 556{ 557 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a; 558 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b; 559 560 if (!test_bit(QDF_USER, &qd_a->qd_flags) != 561 !test_bit(QDF_USER, &qd_b->qd_flags)) { 562 if (test_bit(QDF_USER, &qd_a->qd_flags)) 563 return -1; 564 else 565 return 1; 566 } 567 if (qd_a->qd_id < qd_b->qd_id) 568 return -1; 569 if (qd_a->qd_id > qd_b->qd_id) 570 return 1; 571 572 return 0; 573} 574 575static void do_qc(struct gfs2_quota_data *qd, s64 change) 576{ 577 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 578 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); 579 struct gfs2_quota_change *qc = qd->qd_bh_qc; 580 s64 x; 581 582 mutex_lock(&sdp->sd_quota_mutex); 583 gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1); 584 585 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) { 586 qc->qc_change = 0; 587 qc->qc_flags = 0; 588 if (test_bit(QDF_USER, &qd->qd_flags)) 589 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER); 590 qc->qc_id = cpu_to_be32(qd->qd_id); 591 } 592 593 x = be64_to_cpu(qc->qc_change) + change; 594 qc->qc_change = cpu_to_be64(x); 595 596 spin_lock(&qd_lru_lock); 597 qd->qd_change = x; 598 spin_unlock(&qd_lru_lock); 599 600 if (!x) { 601 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags)); 602 clear_bit(QDF_CHANGE, &qd->qd_flags); 603 qc->qc_flags = 0; 604 qc->qc_id = 0; 605 slot_put(qd); 606 qd_put(qd); 607 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) { 608 qd_hold(qd); 609 slot_hold(qd); 610 } 611 612 mutex_unlock(&sdp->sd_quota_mutex); 613} 614 615/** 616 * gfs2_adjust_quota - adjust record of current block usage 617 * @ip: The quota inode 618 * @loc: Offset of the entry in the quota file 619 * @change: The amount of usage change to record 620 * @qd: The quota data 621 * @fdq: The updated limits to record 622 * 623 * This function was mostly borrowed from gfs2_block_truncate_page which was 624 * in turn mostly borrowed from ext3 625 * 626 * Returns: 0 or -ve on error 627 */ 628 629static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc, 630 s64 change, struct gfs2_quota_data *qd, 631 struct fs_disk_quota *fdq) 632{ 633 struct inode *inode = &ip->i_inode; 634 struct address_space *mapping = inode->i_mapping; 635 unsigned long index = loc >> PAGE_CACHE_SHIFT; 636 unsigned offset = loc & (PAGE_CACHE_SIZE - 1); 637 unsigned blocksize, iblock, pos; 638 struct buffer_head *bh, *dibh; 639 struct page *page; 640 void *kaddr, *ptr; 641 struct gfs2_quota q, *qp; 642 int err, nbytes; 643 u64 size; 644 645 if (gfs2_is_stuffed(ip)) 646 gfs2_unstuff_dinode(ip, NULL); 647 648 memset(&q, 0, sizeof(struct gfs2_quota)); 649 err = gfs2_internal_read(ip, NULL, (char *)&q, &loc, sizeof(q)); 650 if (err < 0) 651 return err; 652 653 err = -EIO; 654 qp = &q; 655 qp->qu_value = be64_to_cpu(qp->qu_value); 656 qp->qu_value += change; 657 qp->qu_value = cpu_to_be64(qp->qu_value); 658 qd->qd_qb.qb_value = qp->qu_value; 659 if (fdq) { 660 if (fdq->d_fieldmask & FS_DQ_BSOFT) { 661 qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit); 662 qd->qd_qb.qb_warn = qp->qu_warn; 663 } 664 if (fdq->d_fieldmask & FS_DQ_BHARD) { 665 qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit); 666 qd->qd_qb.qb_limit = qp->qu_limit; 667 } 668 } 669 670 /* Write the quota into the quota file on disk */ 671 ptr = qp; 672 nbytes = sizeof(struct gfs2_quota); 673get_a_page: 674 page = grab_cache_page(mapping, index); 675 if (!page) 676 return -ENOMEM; 677 678 blocksize = inode->i_sb->s_blocksize; 679 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); 680 681 if (!page_has_buffers(page)) 682 create_empty_buffers(page, blocksize, 0); 683 684 bh = page_buffers(page); 685 pos = blocksize; 686 while (offset >= pos) { 687 bh = bh->b_this_page; 688 iblock++; 689 pos += blocksize; 690 } 691 692 if (!buffer_mapped(bh)) { 693 gfs2_block_map(inode, iblock, bh, 1); 694 if (!buffer_mapped(bh)) 695 goto unlock_out; 696 /* If it's a newly allocated disk block for quota, zero it */ 697 if (buffer_new(bh)) 698 zero_user(page, pos - blocksize, bh->b_size); 699 } 700 701 if (PageUptodate(page)) 702 set_buffer_uptodate(bh); 703 704 if (!buffer_uptodate(bh)) { 705 ll_rw_block(READ_META, 1, &bh); 706 wait_on_buffer(bh); 707 if (!buffer_uptodate(bh)) 708 goto unlock_out; 709 } 710 711 gfs2_trans_add_bh(ip->i_gl, bh, 0); 712 713 kaddr = kmap_atomic(page, KM_USER0); 714 if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE) 715 nbytes = PAGE_CACHE_SIZE - offset; 716 memcpy(kaddr + offset, ptr, nbytes); 717 flush_dcache_page(page); 718 kunmap_atomic(kaddr, KM_USER0); 719 unlock_page(page); 720 page_cache_release(page); 721 722 /* If quota straddles page boundary, we need to update the rest of the 723 * quota at the beginning of the next page */ 724 if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) { 725 ptr = ptr + nbytes; 726 nbytes = sizeof(struct gfs2_quota) - nbytes; 727 offset = 0; 728 index++; 729 goto get_a_page; 730 } 731 732 /* Update the disk inode timestamp and size (if extended) */ 733 err = gfs2_meta_inode_buffer(ip, &dibh); 734 if (err) 735 goto out; 736 737 size = loc + sizeof(struct gfs2_quota); 738 if (size > inode->i_size) { 739 ip->i_disksize = size; 740 i_size_write(inode, size); 741 } 742 inode->i_mtime = inode->i_atime = CURRENT_TIME; 743 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 744 gfs2_dinode_out(ip, dibh->b_data); 745 brelse(dibh); 746 mark_inode_dirty(inode); 747 748out: 749 return err; 750unlock_out: 751 unlock_page(page); 752 page_cache_release(page); 753 return err; 754} 755 756static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda) 757{ 758 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd; 759 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 760 unsigned int data_blocks, ind_blocks; 761 struct gfs2_holder *ghs, i_gh; 762 unsigned int qx, x; 763 struct gfs2_quota_data *qd; 764 loff_t offset; 765 unsigned int nalloc = 0, blocks; 766 struct gfs2_alloc *al = NULL; 767 int error; 768 769 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota), 770 &data_blocks, &ind_blocks); 771 772 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS); 773 if (!ghs) 774 return -ENOMEM; 775 776 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL); 777 mutex_lock_nested(&ip->i_inode.i_mutex, I_MUTEX_QUOTA); 778 for (qx = 0; qx < num_qd; qx++) { 779 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE, 780 GL_NOCACHE, &ghs[qx]); 781 if (error) 782 goto out; 783 } 784 785 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 786 if (error) 787 goto out; 788 789 for (x = 0; x < num_qd; x++) { 790 offset = qd2offset(qda[x]); 791 if (gfs2_write_alloc_required(ip, offset, 792 sizeof(struct gfs2_quota))) 793 nalloc++; 794 } 795 796 al = gfs2_alloc_get(ip); 797 if (!al) { 798 error = -ENOMEM; 799 goto out_gunlock; 800 } 801 /* 802 * 1 blk for unstuffing inode if stuffed. We add this extra 803 * block to the reservation unconditionally. If the inode 804 * doesn't need unstuffing, the block will be released to the 805 * rgrp since it won't be allocated during the transaction 806 */ 807 al->al_requested = 1; 808 /* +3 in the end for unstuffing block, inode size update block 809 * and another block in case quota straddles page boundary and 810 * two blocks need to be updated instead of 1 */ 811 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3; 812 813 if (nalloc) 814 al->al_requested += nalloc * (data_blocks + ind_blocks); 815 error = gfs2_inplace_reserve(ip); 816 if (error) 817 goto out_alloc; 818 819 if (nalloc) 820 blocks += al->al_rgd->rd_length + nalloc * ind_blocks + RES_STATFS; 821 822 error = gfs2_trans_begin(sdp, blocks, 0); 823 if (error) 824 goto out_ipres; 825 826 for (x = 0; x < num_qd; x++) { 827 qd = qda[x]; 828 offset = qd2offset(qd); 829 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL); 830 if (error) 831 goto out_end_trans; 832 833 do_qc(qd, -qd->qd_change_sync); 834 } 835 836 error = 0; 837 838out_end_trans: 839 gfs2_trans_end(sdp); 840out_ipres: 841 gfs2_inplace_release(ip); 842out_alloc: 843 gfs2_alloc_put(ip); 844out_gunlock: 845 gfs2_glock_dq_uninit(&i_gh); 846out: 847 while (qx--) 848 gfs2_glock_dq_uninit(&ghs[qx]); 849 mutex_unlock(&ip->i_inode.i_mutex); 850 kfree(ghs); 851 gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl); 852 return error; 853} 854 855static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd) 856{ 857 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 858 struct gfs2_quota q; 859 struct gfs2_quota_lvb *qlvb; 860 loff_t pos; 861 int error; 862 863 memset(&q, 0, sizeof(struct gfs2_quota)); 864 pos = qd2offset(qd); 865 error = gfs2_internal_read(ip, NULL, (char *)&q, &pos, sizeof(q)); 866 if (error < 0) 867 return error; 868 869 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb; 870 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC); 871 qlvb->__pad = 0; 872 qlvb->qb_limit = q.qu_limit; 873 qlvb->qb_warn = q.qu_warn; 874 qlvb->qb_value = q.qu_value; 875 qd->qd_qb = *qlvb; 876 877 return 0; 878} 879 880static int do_glock(struct gfs2_quota_data *qd, int force_refresh, 881 struct gfs2_holder *q_gh) 882{ 883 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 884 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 885 struct gfs2_holder i_gh; 886 int error; 887 888restart: 889 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh); 890 if (error) 891 return error; 892 893 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb; 894 895 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) { 896 gfs2_glock_dq_uninit(q_gh); 897 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 898 GL_NOCACHE, q_gh); 899 if (error) 900 return error; 901 902 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 903 if (error) 904 goto fail; 905 906 error = update_qd(sdp, qd); 907 if (error) 908 goto fail_gunlock; 909 910 gfs2_glock_dq_uninit(&i_gh); 911 gfs2_glock_dq_uninit(q_gh); 912 force_refresh = 0; 913 goto restart; 914 } 915 916 return 0; 917 918fail_gunlock: 919 gfs2_glock_dq_uninit(&i_gh); 920fail: 921 gfs2_glock_dq_uninit(q_gh); 922 return error; 923} 924 925int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid) 926{ 927 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 928 struct gfs2_alloc *al = ip->i_alloc; 929 unsigned int x; 930 int error = 0; 931 932 gfs2_quota_hold(ip, uid, gid); 933 934 if (capable(CAP_SYS_RESOURCE) || 935 sdp->sd_args.ar_quota != GFS2_QUOTA_ON) 936 return 0; 937 938 sort(al->al_qd, al->al_qd_num, sizeof(struct gfs2_quota_data *), 939 sort_qd, NULL); 940 941 for (x = 0; x < al->al_qd_num; x++) { 942 error = do_glock(al->al_qd[x], NO_FORCE, &al->al_qd_ghs[x]); 943 if (error) 944 break; 945 } 946 947 if (!error) 948 set_bit(GIF_QD_LOCKED, &ip->i_flags); 949 else { 950 while (x--) 951 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]); 952 gfs2_quota_unhold(ip); 953 } 954 955 return error; 956} 957 958static int need_sync(struct gfs2_quota_data *qd) 959{ 960 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 961 struct gfs2_tune *gt = &sdp->sd_tune; 962 s64 value; 963 unsigned int num, den; 964 int do_sync = 1; 965 966 if (!qd->qd_qb.qb_limit) 967 return 0; 968 969 spin_lock(&qd_lru_lock); 970 value = qd->qd_change; 971 spin_unlock(&qd_lru_lock); 972 973 spin_lock(>->gt_spin); 974 num = gt->gt_quota_scale_num; 975 den = gt->gt_quota_scale_den; 976 spin_unlock(>->gt_spin); 977 978 if (value < 0) 979 do_sync = 0; 980 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >= 981 (s64)be64_to_cpu(qd->qd_qb.qb_limit)) 982 do_sync = 0; 983 else { 984 value *= gfs2_jindex_size(sdp) * num; 985 value = div_s64(value, den); 986 value += (s64)be64_to_cpu(qd->qd_qb.qb_value); 987 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit)) 988 do_sync = 0; 989 } 990 991 return do_sync; 992} 993 994void gfs2_quota_unlock(struct gfs2_inode *ip) 995{ 996 struct gfs2_alloc *al = ip->i_alloc; 997 struct gfs2_quota_data *qda[4]; 998 unsigned int count = 0; 999 unsigned int x; 1000 1001 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags)) 1002 goto out; 1003 1004 for (x = 0; x < al->al_qd_num; x++) { 1005 struct gfs2_quota_data *qd; 1006 int sync; 1007 1008 qd = al->al_qd[x]; 1009 sync = need_sync(qd); 1010 1011 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]); 1012 1013 if (sync && qd_trylock(qd)) 1014 qda[count++] = qd; 1015 } 1016 1017 if (count) { 1018 do_sync(count, qda); 1019 for (x = 0; x < count; x++) 1020 qd_unlock(qda[x]); 1021 } 1022 1023out: 1024 gfs2_quota_unhold(ip); 1025} 1026 1027#define MAX_LINE 256 1028 1029static int print_message(struct gfs2_quota_data *qd, char *type) 1030{ 1031 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 1032 1033 printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n", 1034 sdp->sd_fsname, type, 1035 (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group", 1036 qd->qd_id); 1037 1038 return 0; 1039} 1040 1041int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid) 1042{ 1043 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1044 struct gfs2_alloc *al = ip->i_alloc; 1045 struct gfs2_quota_data *qd; 1046 s64 value; 1047 unsigned int x; 1048 int error = 0; 1049 1050 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags)) 1051 return 0; 1052 1053 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON) 1054 return 0; 1055 1056 for (x = 0; x < al->al_qd_num; x++) { 1057 qd = al->al_qd[x]; 1058 1059 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) || 1060 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags)))) 1061 continue; 1062 1063 value = (s64)be64_to_cpu(qd->qd_qb.qb_value); 1064 spin_lock(&qd_lru_lock); 1065 value += qd->qd_change; 1066 spin_unlock(&qd_lru_lock); 1067 1068 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) { 1069 print_message(qd, "exceeded"); 1070 quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ? 1071 USRQUOTA : GRPQUOTA, qd->qd_id, 1072 sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN); 1073 1074 error = -EDQUOT; 1075 break; 1076 } else if (be64_to_cpu(qd->qd_qb.qb_warn) && 1077 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value && 1078 time_after_eq(jiffies, qd->qd_last_warn + 1079 gfs2_tune_get(sdp, 1080 gt_quota_warn_period) * HZ)) { 1081 quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ? 1082 USRQUOTA : GRPQUOTA, qd->qd_id, 1083 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN); 1084 error = print_message(qd, "warning"); 1085 qd->qd_last_warn = jiffies; 1086 } 1087 } 1088 1089 return error; 1090} 1091 1092void gfs2_quota_change(struct gfs2_inode *ip, s64 change, 1093 u32 uid, u32 gid) 1094{ 1095 struct gfs2_alloc *al = ip->i_alloc; 1096 struct gfs2_quota_data *qd; 1097 unsigned int x; 1098 1099 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change)) 1100 return; 1101 if (ip->i_diskflags & GFS2_DIF_SYSTEM) 1102 return; 1103 1104 for (x = 0; x < al->al_qd_num; x++) { 1105 qd = al->al_qd[x]; 1106 1107 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) || 1108 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) { 1109 do_qc(qd, change); 1110 } 1111 } 1112} 1113 1114int gfs2_quota_sync(struct super_block *sb, int type, int wait) 1115{ 1116 struct gfs2_sbd *sdp = sb->s_fs_info; 1117 struct gfs2_quota_data **qda; 1118 unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync); 1119 unsigned int num_qd; 1120 unsigned int x; 1121 int error = 0; 1122 1123 sdp->sd_quota_sync_gen++; 1124 1125 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL); 1126 if (!qda) 1127 return -ENOMEM; 1128 1129 do { 1130 num_qd = 0; 1131 1132 for (;;) { 1133 error = qd_fish(sdp, qda + num_qd); 1134 if (error || !qda[num_qd]) 1135 break; 1136 if (++num_qd == max_qd) 1137 break; 1138 } 1139 1140 if (num_qd) { 1141 if (!error) 1142 error = do_sync(num_qd, qda); 1143 if (!error) 1144 for (x = 0; x < num_qd; x++) 1145 qda[x]->qd_sync_gen = 1146 sdp->sd_quota_sync_gen; 1147 1148 for (x = 0; x < num_qd; x++) 1149 qd_unlock(qda[x]); 1150 } 1151 } while (!error && num_qd == max_qd); 1152 1153 kfree(qda); 1154 1155 return error; 1156} 1157 1158static int gfs2_quota_sync_timeo(struct super_block *sb, int type) 1159{ 1160 return gfs2_quota_sync(sb, type, 0); 1161} 1162 1163int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id) 1164{ 1165 struct gfs2_quota_data *qd; 1166 struct gfs2_holder q_gh; 1167 int error; 1168 1169 error = qd_get(sdp, user, id, &qd); 1170 if (error) 1171 return error; 1172 1173 error = do_glock(qd, FORCE, &q_gh); 1174 if (!error) 1175 gfs2_glock_dq_uninit(&q_gh); 1176 1177 qd_put(qd); 1178 return error; 1179} 1180 1181static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf) 1182{ 1183 const struct gfs2_quota_change *str = buf; 1184 1185 qc->qc_change = be64_to_cpu(str->qc_change); 1186 qc->qc_flags = be32_to_cpu(str->qc_flags); 1187 qc->qc_id = be32_to_cpu(str->qc_id); 1188} 1189 1190int gfs2_quota_init(struct gfs2_sbd *sdp) 1191{ 1192 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); 1193 unsigned int blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift; 1194 unsigned int x, slot = 0; 1195 unsigned int found = 0; 1196 u64 dblock; 1197 u32 extlen = 0; 1198 int error; 1199 1200 if (!ip->i_disksize || ip->i_disksize > (64 << 20) || 1201 ip->i_disksize & (sdp->sd_sb.sb_bsize - 1)) { 1202 gfs2_consist_inode(ip); 1203 return -EIO; 1204 } 1205 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block; 1206 sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE); 1207 1208 error = -ENOMEM; 1209 1210 sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks, 1211 sizeof(unsigned char *), GFP_NOFS); 1212 if (!sdp->sd_quota_bitmap) 1213 return error; 1214 1215 for (x = 0; x < sdp->sd_quota_chunks; x++) { 1216 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS); 1217 if (!sdp->sd_quota_bitmap[x]) 1218 goto fail; 1219 } 1220 1221 for (x = 0; x < blocks; x++) { 1222 struct buffer_head *bh; 1223 unsigned int y; 1224 1225 if (!extlen) { 1226 int new = 0; 1227 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen); 1228 if (error) 1229 goto fail; 1230 } 1231 error = -EIO; 1232 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen); 1233 if (!bh) 1234 goto fail; 1235 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) { 1236 brelse(bh); 1237 goto fail; 1238 } 1239 1240 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots; 1241 y++, slot++) { 1242 struct gfs2_quota_change_host qc; 1243 struct gfs2_quota_data *qd; 1244 1245 gfs2_quota_change_in(&qc, bh->b_data + 1246 sizeof(struct gfs2_meta_header) + 1247 y * sizeof(struct gfs2_quota_change)); 1248 if (!qc.qc_change) 1249 continue; 1250 1251 error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER), 1252 qc.qc_id, &qd); 1253 if (error) { 1254 brelse(bh); 1255 goto fail; 1256 } 1257 1258 set_bit(QDF_CHANGE, &qd->qd_flags); 1259 qd->qd_change = qc.qc_change; 1260 qd->qd_slot = slot; 1261 qd->qd_slot_count = 1; 1262 1263 spin_lock(&qd_lru_lock); 1264 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1); 1265 list_add(&qd->qd_list, &sdp->sd_quota_list); 1266 atomic_inc(&sdp->sd_quota_count); 1267 spin_unlock(&qd_lru_lock); 1268 1269 found++; 1270 } 1271 1272 brelse(bh); 1273 dblock++; 1274 extlen--; 1275 } 1276 1277 if (found) 1278 fs_info(sdp, "found %u quota changes\n", found); 1279 1280 return 0; 1281 1282fail: 1283 gfs2_quota_cleanup(sdp); 1284 return error; 1285} 1286 1287void gfs2_quota_cleanup(struct gfs2_sbd *sdp) 1288{ 1289 struct list_head *head = &sdp->sd_quota_list; 1290 struct gfs2_quota_data *qd; 1291 unsigned int x; 1292 1293 spin_lock(&qd_lru_lock); 1294 while (!list_empty(head)) { 1295 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list); 1296 1297 if (atomic_read(&qd->qd_count) > 1 || 1298 (atomic_read(&qd->qd_count) && 1299 !test_bit(QDF_CHANGE, &qd->qd_flags))) { 1300 list_move(&qd->qd_list, head); 1301 spin_unlock(&qd_lru_lock); 1302 schedule(); 1303 spin_lock(&qd_lru_lock); 1304 continue; 1305 } 1306 1307 list_del(&qd->qd_list); 1308 /* Also remove if this qd exists in the reclaim list */ 1309 if (!list_empty(&qd->qd_reclaim)) { 1310 list_del_init(&qd->qd_reclaim); 1311 atomic_dec(&qd_lru_count); 1312 } 1313 atomic_dec(&sdp->sd_quota_count); 1314 spin_unlock(&qd_lru_lock); 1315 1316 if (!atomic_read(&qd->qd_count)) { 1317 gfs2_assert_warn(sdp, !qd->qd_change); 1318 gfs2_assert_warn(sdp, !qd->qd_slot_count); 1319 } else 1320 gfs2_assert_warn(sdp, qd->qd_slot_count == 1); 1321 gfs2_assert_warn(sdp, !qd->qd_bh_count); 1322 1323 gfs2_glock_put(qd->qd_gl); 1324 kmem_cache_free(gfs2_quotad_cachep, qd); 1325 1326 spin_lock(&qd_lru_lock); 1327 } 1328 spin_unlock(&qd_lru_lock); 1329 1330 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count)); 1331 1332 if (sdp->sd_quota_bitmap) { 1333 for (x = 0; x < sdp->sd_quota_chunks; x++) 1334 kfree(sdp->sd_quota_bitmap[x]); 1335 kfree(sdp->sd_quota_bitmap); 1336 } 1337} 1338 1339static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error) 1340{ 1341 if (error == 0 || error == -EROFS) 1342 return; 1343 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) 1344 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error); 1345} 1346 1347static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg, 1348 int (*fxn)(struct super_block *sb, int type), 1349 unsigned long t, unsigned long *timeo, 1350 unsigned int *new_timeo) 1351{ 1352 if (t >= *timeo) { 1353 int error = fxn(sdp->sd_vfs, 0); 1354 quotad_error(sdp, msg, error); 1355 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ; 1356 } else { 1357 *timeo -= t; 1358 } 1359} 1360 1361static void quotad_check_trunc_list(struct gfs2_sbd *sdp) 1362{ 1363 struct gfs2_inode *ip; 1364 1365 while(1) { 1366 ip = NULL; 1367 spin_lock(&sdp->sd_trunc_lock); 1368 if (!list_empty(&sdp->sd_trunc_list)) { 1369 ip = list_entry(sdp->sd_trunc_list.next, 1370 struct gfs2_inode, i_trunc_list); 1371 list_del_init(&ip->i_trunc_list); 1372 } 1373 spin_unlock(&sdp->sd_trunc_lock); 1374 if (ip == NULL) 1375 return; 1376 gfs2_glock_finish_truncate(ip); 1377 } 1378} 1379 1380void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) { 1381 if (!sdp->sd_statfs_force_sync) { 1382 sdp->sd_statfs_force_sync = 1; 1383 wake_up(&sdp->sd_quota_wait); 1384 } 1385} 1386 1387 1388/** 1389 * gfs2_quotad - Write cached quota changes into the quota file 1390 * @sdp: Pointer to GFS2 superblock 1391 * 1392 */ 1393 1394int gfs2_quotad(void *data) 1395{ 1396 struct gfs2_sbd *sdp = data; 1397 struct gfs2_tune *tune = &sdp->sd_tune; 1398 unsigned long statfs_timeo = 0; 1399 unsigned long quotad_timeo = 0; 1400 unsigned long t = 0; 1401 DEFINE_WAIT(wait); 1402 int empty; 1403 1404 while (!kthread_should_stop()) { 1405 1406 /* Update the master statfs file */ 1407 if (sdp->sd_statfs_force_sync) { 1408 int error = gfs2_statfs_sync(sdp->sd_vfs, 0); 1409 quotad_error(sdp, "statfs", error); 1410 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ; 1411 } 1412 else 1413 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t, 1414 &statfs_timeo, 1415 &tune->gt_statfs_quantum); 1416 1417 /* Update quota file */ 1418 quotad_check_timeo(sdp, "sync", gfs2_quota_sync_timeo, t, 1419 "ad_timeo, &tune->gt_quota_quantum); 1420 1421 /* Check for & recover partially truncated inodes */ 1422 quotad_check_trunc_list(sdp); 1423 1424 if (freezing(current)) 1425 refrigerator(); 1426 t = min(quotad_timeo, statfs_timeo); 1427 1428 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE); 1429 spin_lock(&sdp->sd_trunc_lock); 1430 empty = list_empty(&sdp->sd_trunc_list); 1431 spin_unlock(&sdp->sd_trunc_lock); 1432 if (empty && !sdp->sd_statfs_force_sync) 1433 t -= schedule_timeout(t); 1434 else 1435 t = 0; 1436 finish_wait(&sdp->sd_quota_wait, &wait); 1437 } 1438 1439 return 0; 1440} 1441 1442static int gfs2_quota_get_xstate(struct super_block *sb, 1443 struct fs_quota_stat *fqs) 1444{ 1445 struct gfs2_sbd *sdp = sb->s_fs_info; 1446 1447 memset(fqs, 0, sizeof(struct fs_quota_stat)); 1448 fqs->qs_version = FS_QSTAT_VERSION; 1449 1450 switch (sdp->sd_args.ar_quota) { 1451 case GFS2_QUOTA_ON: 1452 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD); 1453 /*FALLTHRU*/ 1454 case GFS2_QUOTA_ACCOUNT: 1455 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT); 1456 break; 1457 case GFS2_QUOTA_OFF: 1458 break; 1459 } 1460 1461 if (sdp->sd_quota_inode) { 1462 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr; 1463 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks; 1464 } 1465 fqs->qs_uquota.qfs_nextents = 1; /* unsupported */ 1466 fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */ 1467 fqs->qs_incoredqs = atomic_read(&qd_lru_count); 1468 return 0; 1469} 1470 1471static int gfs2_get_dqblk(struct super_block *sb, int type, qid_t id, 1472 struct fs_disk_quota *fdq) 1473{ 1474 struct gfs2_sbd *sdp = sb->s_fs_info; 1475 struct gfs2_quota_lvb *qlvb; 1476 struct gfs2_quota_data *qd; 1477 struct gfs2_holder q_gh; 1478 int error; 1479 1480 memset(fdq, 0, sizeof(struct fs_disk_quota)); 1481 1482 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 1483 return -ESRCH; /* Crazy XFS error code */ 1484 1485 if (type == USRQUOTA) 1486 type = QUOTA_USER; 1487 else if (type == GRPQUOTA) 1488 type = QUOTA_GROUP; 1489 else 1490 return -EINVAL; 1491 1492 error = qd_get(sdp, type, id, &qd); 1493 if (error) 1494 return error; 1495 error = do_glock(qd, FORCE, &q_gh); 1496 if (error) 1497 goto out; 1498 1499 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb; 1500 fdq->d_version = FS_DQUOT_VERSION; 1501 fdq->d_flags = (type == QUOTA_USER) ? FS_USER_QUOTA : FS_GROUP_QUOTA; 1502 fdq->d_id = id; 1503 fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit); 1504 fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn); 1505 fdq->d_bcount = be64_to_cpu(qlvb->qb_value); 1506 1507 gfs2_glock_dq_uninit(&q_gh); 1508out: 1509 qd_put(qd); 1510 return error; 1511} 1512 1513/* GFS2 only supports a subset of the XFS fields */ 1514#define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD) 1515 1516static int gfs2_set_dqblk(struct super_block *sb, int type, qid_t id, 1517 struct fs_disk_quota *fdq) 1518{ 1519 struct gfs2_sbd *sdp = sb->s_fs_info; 1520 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 1521 struct gfs2_quota_data *qd; 1522 struct gfs2_holder q_gh, i_gh; 1523 unsigned int data_blocks, ind_blocks; 1524 unsigned int blocks = 0; 1525 int alloc_required; 1526 struct gfs2_alloc *al; 1527 loff_t offset; 1528 int error; 1529 1530 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 1531 return -ESRCH; /* Crazy XFS error code */ 1532 1533 switch(type) { 1534 case USRQUOTA: 1535 type = QUOTA_USER; 1536 if (fdq->d_flags != FS_USER_QUOTA) 1537 return -EINVAL; 1538 break; 1539 case GRPQUOTA: 1540 type = QUOTA_GROUP; 1541 if (fdq->d_flags != FS_GROUP_QUOTA) 1542 return -EINVAL; 1543 break; 1544 default: 1545 return -EINVAL; 1546 } 1547 1548 if (fdq->d_fieldmask & ~GFS2_FIELDMASK) 1549 return -EINVAL; 1550 if (fdq->d_id != id) 1551 return -EINVAL; 1552 1553 error = qd_get(sdp, type, id, &qd); 1554 if (error) 1555 return error; 1556 1557 mutex_lock(&ip->i_inode.i_mutex); 1558 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh); 1559 if (error) 1560 goto out_put; 1561 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1562 if (error) 1563 goto out_q; 1564 1565 /* Check for existing entry, if none then alloc new blocks */ 1566 error = update_qd(sdp, qd); 1567 if (error) 1568 goto out_i; 1569 1570 /* If nothing has changed, this is a no-op */ 1571 if ((fdq->d_fieldmask & FS_DQ_BSOFT) && 1572 (fdq->d_blk_softlimit == be64_to_cpu(qd->qd_qb.qb_warn))) 1573 fdq->d_fieldmask ^= FS_DQ_BSOFT; 1574 if ((fdq->d_fieldmask & FS_DQ_BHARD) && 1575 (fdq->d_blk_hardlimit == be64_to_cpu(qd->qd_qb.qb_limit))) 1576 fdq->d_fieldmask ^= FS_DQ_BHARD; 1577 if (fdq->d_fieldmask == 0) 1578 goto out_i; 1579 1580 offset = qd2offset(qd); 1581 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota)); 1582 if (alloc_required) { 1583 al = gfs2_alloc_get(ip); 1584 if (al == NULL) 1585 goto out_i; 1586 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota), 1587 &data_blocks, &ind_blocks); 1588 blocks = al->al_requested = 1 + data_blocks + ind_blocks; 1589 error = gfs2_inplace_reserve(ip); 1590 if (error) 1591 goto out_alloc; 1592 } 1593 1594 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 1, 0); 1595 if (error) 1596 goto out_release; 1597 1598 /* Apply changes */ 1599 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq); 1600 1601 gfs2_trans_end(sdp); 1602out_release: 1603 if (alloc_required) { 1604 gfs2_inplace_release(ip); 1605out_alloc: 1606 gfs2_alloc_put(ip); 1607 } 1608out_i: 1609 gfs2_glock_dq_uninit(&i_gh); 1610out_q: 1611 gfs2_glock_dq_uninit(&q_gh); 1612out_put: 1613 mutex_unlock(&ip->i_inode.i_mutex); 1614 qd_put(qd); 1615 return error; 1616} 1617 1618const struct quotactl_ops gfs2_quotactl_ops = { 1619 .quota_sync = gfs2_quota_sync, 1620 .get_xstate = gfs2_quota_get_xstate, 1621 .get_dqblk = gfs2_get_dqblk, 1622 .set_dqblk = gfs2_set_dqblk, 1623}; 1624